volume keys not working

Hello I have inspiron 15300 I just bought. Suddenly the keys stopped working. For example when I press the F3 keys(see picture below little box on the right side corner) this find box pops up and when I try to press the F1 keys to mute it brings me to the google chrome help center. Can someone please help me.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

rent working.